I like eating tuna noodle casserole, but I don't make it. Hmm.

I guess applesauce.

It's easy (especially if you just core the apples and leave the skin in for texture, the way I do). Core apples, put apples in slow cooker, leave alone for a long time, come back, stir up and add spices.

It's hard to get comparable results from a store. Applesauce from a store tends to be thin and lack texture, IME.

I really like it.

And it's nice to eat warm, fresh out of the slow cooker, whereas normally I don't heat store-bought applesauce.

EDIT:

I like making casseroles because you can turn almost anything into a casserole.

My favorite nostalgia casserole is sombrero pie, from some Betty Crocker cookbook:

https://dinnerisserved1972.com/2020/09/03/sombrero-pie/

Think sorta beanless chili con carne topped with a cornmeal crust.

I tend to favor having more spiciness in it than it has stock.